#define _CRT_SECURE_NO_WARNINGS 1

#include"string.h"

int main()
{
	my::string s1;
	my::string s2("hello world");
	my::string s3(s2);

	cout << s1.c_str() << endl;
	cout << s2.c_str() << endl;
	cout << s3.c_str() << endl;

	s1 = s3;
	cout << s1.c_str() << endl;

	return 0;
}